Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA4M1AB/SRAM/ECCETST#0x0
TSTBYP=0
ECC Test Control Register
ECC Bypass Select
0 (0): ECC bypass disabled.
1 (1): ECC bypass enabled.
These bits are read as 0000000. The write value should be 0000000.
https://github.com/cmsis-svd/cmsis-svd-data